I'm looking for a desktop application that keeps track of sets and pieces owned. Ideally something that would look up LEGO databases such as Peeron or others in order to add the pieces in a set automatically once on is added. Similarly, said app could tell you which sets you could build with your current pieces, much like Rebrickable.com, as mentioned in a previous question.

I don't think it's a duplicate; the main thing I was after was an app to keep inventory of all your LEGO blocks. But the last part of my question is similar to that one. Shall I remove that part?
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RevenNov 11 '11 at 14:45

@Reven You could reference to the other question in the last part.
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pcantinNov 11 '11 at 15:14

3 Answers
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I know of no desktop applications that have functionality like Rebrickable, but an API has recently been released which would enable any applications to integrate with the site and display this kind of information. I know of one such application currently being developed but not ready for release yet.

After the answers here and much much browsing, I think Rebrickable comes closest to what I wanted, thanks for creating it. I don't know if I should credit this answer, as @Joel Cohen was actually the first to suggest Rebrickable in a comment... Help?
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RevenNov 23 '11 at 7:27

As far as a desktop app for inventorying pieces, I personally use Brickstore as suggested by @Superkalle. Although I use it primarily for preparing Bricklink orders rather than a catalogue of my spare parts and/or sets.

Parts Catalog is a program used to inventory your collection of Lego parts. The main goal is to be able to check 2 list to see which parts are missing. To build your list you could just download certified list of Lego sets and Combine the list. Then add any single parts that may not be from a set.